It is supposed to extend to the height of fifty miles.
Do these fifty miles of air press upon the earth?
They do press upon the earth.
With how much force does the air press on the earth?
With a force of fifteen pounds on every square inch of surface.
Then has the air weight?
The air has weight.
Why do we not feel the weight of the air?
Because it presses with equal force, in every direction; up, down, and on every side.
How can we show that the air presses upwards?